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DATA AND RESULTS PART II: Antacid Tablet Analysis: Brand of antacid used: TUMS 2.395 = mass of whole tablet Trial 1 Trial 2 Trial 3 Mass of crushed antacid tablet (g) 0.509 0.513 Volume of HCl used (mL) 40.0 40.0 Initial reading, NaOH burette (mL) 0.35 1.25 Final reading, NaOH burette (mL) 1.25 2.25 Volume NaOH used (mL) 0.90 1.00 Moles of HCl consumed by antacid (mol) 0.0039 0.0039 Moles of HCl consumed by 1.0 gram of antacid (mol/g) 0.0077 0.0076 Show a sample calculation of the moles of HCl consumed by the antacid tablet and the moles of HCl per gram of antacid tablet below: Average moles of HCl consumed by 1.0 g of antacid tablet: 36.46 mol/g Antacid Tablet Analysis 2: Brand of antacid used: Rolaid 1.402 = mass of tablet Trial 1 Trial 2 Trial 3 Mass of crushed antacid tablet (g) 0.631 0.524 0.522 Volume of HCl used (mL) 20.0 20.0 20.0 Initial reading, NaOH burette (mL) 2.25 6.35 11.85 Final reading, NaOH burette (mL) 6.35 11.85 21.50 Volume NaOH used (mL) 4.10 5.45 9.65 Moles of HCl consumed by antacid (mol) Moles of HCl consumed by 1.0 gram of antacid (mol/g) Show a sample calculation of the moles of HCl consumed by the antacid tablet and the moles of HCl per gram of antacid tablet below: Brand of antacid used: BICARB Trial 1 Trial 2 Trial 3 Mass of crushed antacid tablet (g) 0.568 0.502 0.500 Volume of HCl used (mL) 70.0 70.0 70.0 Initial reading, NaOH burette (mL) 21.50 28.60 29.1 Final reading, NaOH burette (mL) 28.60 44.10 42.6 Volume NaOH used (mL) Moles of HCl consumed by antacid (mol) Moles of HCl consumed by 1.0 gram of antacid (mol/g) Show a sample calculation of the moles of HCl consumed by the antacid tablet and the moles of HCl per gram of antacid tablet below: PostLab Questions 1. What specific acids are found in soft drinks? 2. Which acid is most abundant in colas? 3. Which acid is most abundant in non-cola soft drinks? 4. It was assumed that the concentration of the HCl solution was exactly 0.1 M in this experiment. How exact do you think the concentration of the HCl solution is when prepared by diluting concentrated HCl? Explain. 5. How exact do you think the concentration of the NaOH solution is? Explain. 6. What is the chemical composition of the antacid tablet(s) that you used? (If the exact composition is not given on the label, list the active ingredients.) 7. If the antacid tablet did not dissolve completely in the 0.1 M HCl solution, how can you explain this? 8. Which one of the antacids that you tested appeared to be the most effective? Can you explain the difference between them? 9. Do you think that the antacids that you tested live up to the claims of their manufacturers? (Did it neutralize 47 times its own weight?)

          DATA AND RESULTS

PART II: Antacid Tablet Analysis:

Brand of antacid used: TUMS

2.395 = mass of whole tablet

Trial 1
Trial 2
Trial 3
Mass of crushed antacid tablet (g)
0.509
0.513
Volume of HCl used (mL)
40.0
40.0
Initial reading, NaOH burette (mL)
0.35
1.25
Final reading, NaOH burette (mL)
1.25
2.25
Volume NaOH used (mL)
0.90
1.00
Moles of HCl consumed by antacid (mol)
0.0039
0.0039
Moles of HCl consumed by 1.0 gram of antacid (mol/g)
0.0077
0.0076

Show a sample calculation of the moles of HCl consumed by the antacid tablet and the moles of HCl per gram of antacid tablet below:

Average moles of HCl consumed by 1.0 g of antacid tablet: 36.46 mol/g

Antacid Tablet Analysis 2:

Brand of antacid used: Rolaid

1.402 = mass of tablet

Trial 1
Trial 2
Trial 3
Mass of crushed antacid tablet (g)
0.631
0.524
0.522
Volume of HCl used (mL)
20.0
20.0
20.0
Initial reading, NaOH burette (mL)
2.25
6.35
11.85
Final reading, NaOH burette (mL)
6.35
11.85
21.50
Volume NaOH used (mL)
4.10
5.45
9.65
Moles of HCl consumed by antacid (mol)
Moles of HCl consumed by 1.0 gram of antacid (mol/g)

Show a sample calculation of the moles of HCl consumed by the antacid tablet and the moles of HCl per gram of antacid tablet below:

Brand of antacid used: BICARB

Trial 1
Trial 2
Trial 3
Mass of crushed antacid tablet (g)
0.568
0.502
0.500
Volume of HCl used (mL)
70.0
70.0
70.0
Initial reading, NaOH burette (mL)
21.50
28.60
29.1
Final reading, NaOH burette (mL)
28.60
44.10
42.6
Volume NaOH used (mL)
Moles of HCl consumed by antacid (mol)
Moles of HCl consumed by 1.0 gram of antacid (mol/g)

Show a sample calculation of the moles of HCl consumed by the antacid tablet and the moles of HCl per gram of antacid tablet below:

PostLab Questions

1. What specific acids are found in soft drinks?
2. Which acid is most abundant in colas?
3. Which acid is most abundant in non-cola soft drinks?
4. It was assumed that the concentration of the HCl solution was exactly 0.1 M in this experiment. How exact do you think the concentration of the HCl solution is when prepared by diluting concentrated HCl? Explain.
5. How exact do you think the concentration of the NaOH solution is? Explain.
6. What is the chemical composition of the antacid tablet(s) that you used? (If the exact composition is not given on the label, list the active ingredients.)
7. If the antacid tablet did not dissolve completely in the 0.1 M HCl solution, how can you explain this?
8. Which one of the antacids that you tested appeared to be the most effective? Can you explain the difference between them?
9. Do you think that the antacids that you tested live up to the claims of their manufacturers? (Did it neutralize 47 times its own weight?)

Added by Wayne T.

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